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Position: Senior .NET Software Engineer Salary: up to 27 600 PLN, B2B; 23 000 PLN, perm contract Working model: Hybrid Our client is one of the world’s leading companies providing innovative products for the sports industry. They collect, organize, and deliver high-quality sports data, helping sports enthusiasts, media, and betting organizations achieve their goals. They connect people through what they do, and create a better world for sports every single day The role: We are currently looking for an experienced talent who would like to join the R&D group and work with us to solve complex problems As a product company, they are looking for long-term cooperation. Your role as Senior Developer requires quality engineering experience. You will be a team player cooperating with other Developers, Product Managers, QA, System Architects, and a Tech Leader. You will spend your time mostly on: – coding new features (60%) – maintenance and bug fixing (20%) – internal meetings and analyses (20%) Requirements: Minimum 5 years of professional experience in backend development, with a proven track record of deploying production-grade services Sound experience in C# .Net Core Proficiency in real-time messaging systems and technologies such as RabbitMQ and Kafka Strong experience with SQL and NoSQL databases like MySQL, PostgreSQL, or MongoDB Familiarity with cloud computing platforms such as AWS, Azure, or Google Cloud, Good understanding of containerized architecture such as Docker, Kubernetes Finished studies in a technical field like computer science, mathematics, physics, or a related area A very good English (both written and spoken) Willingness to work in a hybrid mode Nice to have: Experience in frontend frameworks such as Angular, React or Vue.Js Proficiency in scripting languages like Python, Bash, Powershell Responsibilities : Lead the development and deployment process of robust, scalable backend services Collaborate with system architects, data scientists, and product managers to define and implement business logic and data models. Maintain and optimize existing backend systems for performance, reliability, and scalability. Conduct code reviews, enforce coding standards, and mentor junior engineers to elevate code quality across the team. Stay informed about new backend technologies and assess their usability for current and future projects. Establish good relationships with your teammates and partners, understand requirements, create code, automatic tests, and documentation Benefits: Life insurance Medical Care Fresh Fruits and Beverages English hours E-learning Company library Training Food card Birthday celebration Free days & remote work Welcome pack Team integration bonus Happy hours Company picnics Integrations trips